CR_028: NZ biomass-heat cost, fuel & feasibility 2026 (web synthesis

CR_028: NZ biomass-heat cost, fuel & feasibility 2026 (web synthesis

NZ biomass-heat cost, fuel & feasibility (2026 web synthesis)

Populates the biomass-heat model cells for V1+ activation (RT_247–249)

A web synthesis of authoritative NZ sources giving the data to activate biomass district heat in the model: wood-fuel price, energy content, boiler efficiency, installed boiler cost, and the NES-AQ airshed feasibility filter. ⚠ AI-synthesised; fuel prices are 2020-vintage; boiler cost is from industrial-scale GIDI projects (community-scale $/kW likely higher). data_quality medium.

Source verification (audit 2026-06-22) — MISMATCH (both numbers)

(1) biomass_efficiency 0.85 is NOT in the cited Bioenergy Assoc source (it states 94% for pellet boilers) — 0.85 is a defensible textbook value but is not document-sourced → demoted to assumed. (2) Wood-chip price corrected: the cited “12.50–18/GJ" is wrong — Bioenergy Assoc **TNSB74 Table 1 = 9.0–15.0/GJ** for wood-chip. The model’s ④e wood_chip is corrected 15 → 12/GJ and re-sourced to TNSB74.

Summary

Brings together NZ wood-fuel pricing and energy content (Bioenergy Association), biomass boiler installed cost and efficiency (EECA GIDI + Bioenergy Association), and the National Environmental Standard for Air Quality (NES-AQ) airshed rules (MfE + regional councils) — the parameters the model needs to cost and gate a community biomass district-heat plant (the V1+ heat option).

Key claims

- claim: "Wood-fuel price & energy content (RT_247): NZ wood chip is priced on an energy basis at $12.50–$18/GJ (central ~$15/GJ) = 4.5–6.5 c/kWh of fuel energy (Bioenergy Association; 2020 prices at ~$25/t carbon — chip is relatively cheaper now as carbon prices rose); pellets overlap the top of the chip range. Calorific value: oven-dry wood 18.5–19 MJ/kg, air-dried (12–20% moisture) 13–16 MJ/kg; GJ/tonne ≈ 19.2 − 0.2164 × moisture%. Fuel moisture ranges from <10% (processing by-products) to ~50% (forest chips)."
  source_location: "Bioenergy Association TNSB74 / usewoodfuel; FAO Wood Fuels Handbook"
- claim: "Boiler efficiency (RT_247): modern automated wood-chip/pellet boilers run ~85–94% efficiency (wood-pellet boilers up to 94%, Bioenergy Association). NES requires ≥65% thermal efficiency for compliant domestic burners; efficiency rises ~0.5% per 1% of moisture removed. Boiler/moisture match: domestic (≤100 kW) 20–25% MC, medium (100 kW–1 MW) <35%, large (>1 MW) up to 55–60% MC. Delivered-heat cost ≈ fuel ÷ efficiency ≈ 5–8 c/kWh-heat — cheaper than the ~25–27 c/kWh of avoidable grid electricity (RD_018) and consistent with int_001's '1/3–1/4 the cost of gas'."
  source_location: "Bioenergy Association wood-energy pages; derived"
- claim: "Boiler installed cost (RT_248): a new biomass boiler costs ~NZD 1,100,000/MW on average (GIDI-funded projects), as low as $750,000/MW → ~NZD 1,100/kW_th (range ~750–1,100/kW_th industrial scale); converting an existing coal boiler to biomass is far cheaper (~$290,000/MW average, some $80,000/MW). On a $/MW basis a biomass boiler is ~the same as a coal boiler. SNZ PAS 5311:2021 covers small–medium boilers (50 kW–2 MW, the community range). ⚠ The $/kW figures are from large industrial GIDI projects (e.g. Fonterra Te Awamutu 43 MW coal→pellet, $12M, ~4% efficiency gain, 98.4% GHG cut / 89,000 tCO₂-e/yr) — community-scale (50 kW–2 MW) cost per kW is likely HIGHER (less economy of scale)."
  source_location: "EECA 'Biomass boilers for industrial process heat' (GIDI data, Fonterra case)"
- claim: "Airshed / NES-AQ feasibility (RT_249): the Resource Management (NES for Air Quality) Regulations 2004 (regs 22–24) govern woodburners — a burner installed after 1 Sept 2005 on a property <2 ha must emit ≤1.5 g particles/kg dry wood and have thermal efficiency ≥65%. In POLLUTED airsheds, regional councils impose stricter rules or bans: e.g. Waikato (open-fire prohibitions in the Putāruru, Taupō, Te Kūiti, Tokoroa airsheds), Otago Airzone 1 (non-NES burners banned in Alexandra/Arrowtown/Cromwell/Clyde), Canterbury Airzone 1 (open fires + burners ≥15 yrs banned 1 Apr–30 Sept, incl. parts of Christchurch/Kaiapoi). Tasman District Council operates air-quality management. The biomass airshed_restricted feasibility filter is therefore region/airshed-specific."
  source_location: "MfE NES for Air Quality 2004; Waikato/Otago/Canterbury/Tasman council rules"

Retrieval provenance

• Upstream: Bioenergy Association NZ (TNSB74 fuel pricing, wood-energy/wood-pellet pages, usewoodfuel.org.nz); EECA “Biomass boilers for industrial process heat” insights (GIDI cost data + Fonterra case); FAO Wood Fuels Handbook (calorific value); MfE NES-AQ 2004 + Waikato/Otago/Canterbury/Tasman council airshed rules.
• Retrieved via: WebSearch + WebFetch (web research), 2026-06-12. (Full queries + the per-source extracts in the _retrieval.md sidecar.)
• Verification: AI-synthesised from public pages; fuel prices 2020-vintage; boiler $/kW from industrial GIDI projects (community-scale higher); a usewoodfuel case study (Zealandia, 1600+2500 kW) was member-gated. data_quality: medium; confirm fuel price + a community-scale boiler quote before publishing.

Neobiome Intelligence relevance

Populates the biomass-heat tech for V1+ activation — the data the spec’s deferred biomass option needs:

• biomass_boiler cost ≈ 1,100 NZD/kW_th (industrial floor; community-scale likely higher → use ~1,500–2,500 with a flag) — the biomass analogue of the heat-pump cost cell.
• Fuel-flow: wood chip ≈ $15/GJ (4.5–6.5 c/kWh-fuel) consumed at a ~85% boiler efficiency → delivered heat ~5–8 c/kWh (calorific value via GJ/t = 19.2 − 0.2164·MC). The model’s biomass consumes fuel → produces heat coefficient.
• airshed_restricted feasibility filter: gate biomass on the site’s airshed (polluted-airshed councils restrict/ban solid-fuel burning) — the concrete rule behind RT_249 (joins OT_074’s NES-AQ mid-2027 reform).
• Design signal: biomass delivered heat (~5–8 c/kWh) is competitive with heat-pump heat (COP 4 on ~27 c ≈ 7 c/kWh-heat) — biomass wins on high-temp/dry-year/airshed-OK rural sites; heat pumps win in restricted airsheds. ⚠ AI-synthesised, 2020 fuel vintage, industrial-scale boiler cost. Resolves RT_247, RT_248, RT_249 (residual: a community-scale (50 kW–2 MW) boiler $/kW quote and a wood-stove household cost would firm them).

Research targets

Research gaps

• A community-scale (50 kW–2 MW) biomass boiler installed-cost quote (vs the industrial GIDI ~$1,100/kW_th) and a household wood-stove cost would lift RT_248 from medium to high — noted, no new RT.

Connections

Links to

Sources (1): OT_074

Referenced by

Sources (3): OT_079 · OT_089 · OT_157

EDT domains (1): D01: Renewable Energy & Storage Systems

Technologies (1): Biomass District Heating (Wood Chip)